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//===--- DependencyChecking.cpp -------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "DependencyChecking.h"
#include "swift/AST/SourceFile.h"
#include "swift/Frontend/Frontend.h"
using namespace swift;
namespace {
/// For each dependency file in \p CI, run \p callback until the callback
/// returns \c true. Returns \c true if any callback call returns \c true, \c
/// false otherwise.
static bool
forEachDependencyUntilTrue(CompilerInstance &CI,
std::optional<unsigned> excludeBufferID,
llvm::function_ref<bool(StringRef)> callback) {
// Check files in the current module. If 'excludeBufferID' is None, exclude
// all source files.
if (excludeBufferID.has_value()) {
for (FileUnit *file : CI.getMainModule()->getFiles()) {
StringRef filename;
if (auto SF = dyn_cast<SourceFile>(file)) {
if (SF->getBufferID() == excludeBufferID)
continue;
filename = SF->getFilename();
} else if (auto LF = dyn_cast<LoadedFile>(file))
filename = LF->getFilename();
else
continue;
// Ignore synthesized files.
if (filename.empty() || filename.front() == '<')
continue;
if (callback(filename))
return true;
}
}
// Check other non-system depenencies (e.g. modules, headers).
for (auto &dep : CI.getDependencyTracker()->getDependencies()) {
if (callback(dep))
return true;
}
for (auto dep : CI.getDependencyTracker()->getIncrementalDependencyPaths()) {
if (callback(dep))
return true;
}
for (auto dep : CI.getDependencyTracker()->getMacroPluginDependencyPaths()) {
if (callback(dep))
return true;
}
return false;
}
/// Collect hash codes of the dependencies into \c Map.
static void cacheDependencyHashIfNeeded(CompilerInstance &CI,
std::optional<unsigned> excludeBufferID,
llvm::StringMap<llvm::hash_code> &Map) {
auto &FS = CI.getFileSystem();
forEachDependencyUntilTrue(CI, excludeBufferID, [&](StringRef filename) {
if (Map.count(filename))
return false;
auto stat = FS.status(filename);
if (!stat)
return false;
// We will check the hash only if the modification time of the dependecy
// is zero. See 'areAnyDependentFilesInvalidated() below'.
if (stat->getLastModificationTime() != llvm::sys::TimePoint<>())
return false;
auto buf = FS.getBufferForFile(filename);
Map[filename] = llvm::hash_value(buf.get()->getBuffer());
return false;
});
}
/// Check if any dependent files are modified since \p timestamp.
static bool
areAnyDependentFilesInvalidated(CompilerInstance &CI, llvm::vfs::FileSystem &FS,
std::optional<unsigned> excludeBufferID,
llvm::sys::TimePoint<> timestamp,
const llvm::StringMap<llvm::hash_code> &Map) {
return forEachDependencyUntilTrue(
CI, excludeBufferID, [&](StringRef filePath) {
auto stat = FS.status(filePath);
if (!stat)
// Missing.
return true;
auto lastModTime = stat->getLastModificationTime();
if (lastModTime > timestamp)
// Modified.
return true;
// If the last modification time is zero, this file is probably from a
// virtual file system. We need to check the content.
if (lastModTime == llvm::sys::TimePoint<>()) {
// Get the hash code of the last content.
auto oldHashEntry = Map.find(filePath);
if (oldHashEntry == Map.end())
// Unreachable? Not virtual in old filesystem, but virtual in new
// one.
return true;
auto oldHash = oldHashEntry->second;
// Calculate the hash code of the current content.
auto newContent = FS.getBufferForFile(filePath);
if (!newContent)
// Unreachable? stat succeeded, but coundn't get the content.
return true;
auto newHash = llvm::hash_value(newContent.get()->getBuffer());
if (oldHash != newHash)
return true;
}
return false;
});
}
} // namespace
void ide::cacheDependencyHashIfNeeded(CompilerInstance &CI,
std::optional<unsigned> excludeBufferID,
llvm::StringMap<llvm::hash_code> &Map) {
return ::cacheDependencyHashIfNeeded(CI, excludeBufferID, Map);
}
bool ide::areAnyDependentFilesInvalidated(
CompilerInstance &CI, llvm::vfs::FileSystem &FS,
std::optional<unsigned> excludeBufferID, llvm::sys::TimePoint<> timestamp,
const llvm::StringMap<llvm::hash_code> &Map) {
return ::areAnyDependentFilesInvalidated(CI, FS, excludeBufferID, timestamp,
Map);
}
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